/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.mbeans;

import java.util.ArrayList;
import java.util.Iterator;

import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.RuntimeOperationsException;

import org.apache.catalina.Group;
import org.apache.catalina.Role;
import org.apache.catalina.User;
import org.apache.tomcat.util.modeler.BaseModelMBean;
import org.apache.tomcat.util.modeler.ManagedBean;
import org.apache.tomcat.util.modeler.Registry;

/**
 * <p>
 * A <strong>ModelMBean</strong> implementation for the
 * <code>org.apache.catalina.Group</code> component.
 * </p>
 * 
 * @author Craig R. McClanahan
 * @version $Revision: 467222 $ $Date: 2006-10-24 11:17:11 +0800 (星期二, 24 十月
 *          2006) $
 */

public class GroupMBean extends BaseModelMBean {

	// ----------------------------------------------------------- Constructors

	/**
	 * Construct a <code>ModelMBean</code> with default
	 * <code>ModelMBeanInfo</code> information.
	 * 
	 * @exception MBeanException
	 *                if the initializer of an object throws an exception
	 * @exception RuntimeOperationsException
	 *                if an IllegalArgumentException occurs
	 */
	public GroupMBean() throws MBeanException, RuntimeOperationsException {

		super();

	}

	// ----------------------------------------------------- Instance Variables

	/**
	 * The configuration information registry for our managed beans.
	 */
	protected Registry registry = MBeanUtils.createRegistry();

	/**
	 * The <code>MBeanServer</code> in which we are registered.
	 */
	protected MBeanServer mserver = MBeanUtils.createServer();

	/**
	 * The <code>ManagedBean</code> information describing this MBean.
	 */
	protected ManagedBean managed = registry.findManagedBean("Group");

	// ------------------------------------------------------------- Attributes

	/**
	 * Return the MBean Names of all authorized roles for this group.
	 */
	public String[] getRoles() {

		Group group = (Group) this.resource;
		ArrayList results = new ArrayList();
		Iterator roles = group.getRoles();
		while (roles.hasNext()) {
			Role role = null;
			try {
				role = (Role) roles.next();
				ObjectName oname = MBeanUtils.createObjectName(managed
						.getDomain(), role);
				results.add(oname.toString());
			} catch (MalformedObjectNameException e) {
				IllegalArgumentException iae = new IllegalArgumentException(
						"Cannot create object name for role " + role);
				iae.initCause(e);
				throw iae;
			}
		}
		return ((String[]) results.toArray(new String[results.size()]));

	}

	/**
	 * Return the MBean Names of all users that are members of this group.
	 */
	public String[] getUsers() {

		Group group = (Group) this.resource;
		ArrayList results = new ArrayList();
		Iterator users = group.getUsers();
		while (users.hasNext()) {
			User user = null;
			try {
				user = (User) users.next();
				ObjectName oname = MBeanUtils.createObjectName(managed
						.getDomain(), user);
				results.add(oname.toString());
			} catch (MalformedObjectNameException e) {
				IllegalArgumentException iae = new IllegalArgumentException(
						"Cannot create object name for user " + user);
				iae.initCause(e);
				throw iae;
			}
		}
		return ((String[]) results.toArray(new String[results.size()]));

	}

	// ------------------------------------------------------------- Operations

	/**
	 * Add a new {@link Role} to those this group belongs to.
	 * 
	 * @param rolename
	 *            Role name of the new role
	 */
	public void addRole(String rolename) {

		Group group = (Group) this.resource;
		if (group == null) {
			return;
		}
		Role role = group.getUserDatabase().findRole(rolename);
		if (role == null) {
			throw new IllegalArgumentException("Invalid role name '" + rolename
					+ "'");
		}
		group.addRole(role);

	}

	/**
	 * Remove a {@link Role} from those this group belongs to.
	 * 
	 * @param rolename
	 *            Role name of the old role
	 */
	public void removeRole(String rolename) {

		Group group = (Group) this.resource;
		if (group == null) {
			return;
		}
		Role role = group.getUserDatabase().findRole(rolename);
		if (role == null) {
			throw new IllegalArgumentException("Invalid role name '" + rolename
					+ "'");
		}
		group.removeRole(role);

	}

}
